# -*- coding: utf-8 -*-

import sys, pygame

"""
Parte de la introducción a pygame de 
http://www.losersjuegos.com.ar/referencia/articulos/pygame_intro/pygame_intro.php
"""

pygame.init()

size = width, height = 320, 240
speed = [1, 1]
black = 0, 0, 0

screen = pygame.display.set_mode(size)

ball = pygame.image.load("pelota.png")
ballrect = ball.get_rect()

while 1:
    
    for event in pygame.event.get():
    
        if event.type == pygame.QUIT:
            sys.exit()
       
    ballrect = ballrect.move(speed)

    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = -speed[0]
        
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = -speed[1]

    screen.fill(black)
    screen.blit(ball, ballrect)
    pygame.display.flip()
    pygame.time.delay(10)

